Rotary drill bit



May l5, 1928.

l. F. HARRIS ROTARY DRILL BIT Filod March 25. 1924 2 Sheets-5heet 1 attarde,

Patented may l5, i928.

UNITED STATES rar-:Nr oFFlcE.

IRVI'N F. HARRIS, OF WAXAHACHIE, TEXAS.

ROTARY :DRILL BIT.

Application led March 25, 1924. Serial No. 701,774.

Another object of the invention is to prop vide means for retracting the sections of the bit when it is desired to withdraw the bit from its tube.

A still further object of the invention is to provide means for locking the bit in its active position, the locking result being accomplished automatically.

lVith the foregoing and other Objects in view which will appear as the description proceeds7 the invention resides in the coinbination and arrangement of parts and in the details of construction hereinafter described and claimed, it beingl understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing: i

flligure lv's an elevational view of a drill constructed in accordance with the invention, the bit and support thereon being shown in dotted lines.

Figure 2 is an enlarged sectional View through the device.

Figure 3 is an elevational view taken at right angles to Figure 1.

Figure 4- is a longitudinal sectional view through the upper portion of the device.

Figure 5 is a sectional View taken on line 5-5 of Figure 4.*

Figure G is an end elevational View of the lower-section of the device.

lligure 7 is a fraginental elevational View of the lower end of the lower section.

Figure 8 is an enlarged vertical sectional view through the device showing the blades in their inactive positions.

Referring to the drawings in detail, the reference character 5 designates the outer supporting tube formed with passageways 6 extending throughout the length thereof, which passageways allow fluid to pass downwardly to the bit.

The reference character 7 designates the inner guiding tube having enlargement 26 and which is formed with lateral oppositely disposed elongated openings 8 through which the upper ends of the bits proper extend. it the lower end of the tube 7 is a reinforcing band 7.

The drill is of the sectional type and ernbodies a lower section 9 formed with a reduced portion to receive the sleeve 10 formed with cut out portions defining arms 10 disposed at oppositesides thereof, the walls of the cut outl portions being inclined as clearly shown by Figure 3 of the drawings. A pin 12 connects thev arms 10 of the sleeve 10, and at the same time provides a support for the blades 13 that are formed with inclinedelongated openings ll that accommodate the pin so that upon movement of the section 9 within the sleeve 10, the blades will be guided into or out of their active positions by the contact of the pin 12 with the walls of the elongated openings.

The lower section 9 is formed with spaced arms 11 which support a pin 15 that passes through the elongated openings 16 formed in the blades 13y and disposed above the opening' 14 which pin contacting with the walls of 'the openings 16 cause the blades to be held against movement when the blades have been moved to their active positions.

Operating Within the lower section 9 is a sliding section l17 provided with an elongated opening la to accommodate the pin 18 that extends through the lower section '9 so that slight movement of the Section 17 longitudinally of the section 9 will be permitted. i Secured to the upper end of the section 17 by means of pin 17, is a sleeve 19 which is formed with lateral cut out portions 20 through which the blades 20, which act .to lock the sections together, extend.

rl`he lower end of the member 17 is pro-A vided with cam surfaces 18', designedy to be moved over the upper ends of the blades 13 and cooperate with the upper inclined surfaces 13 of the blades to cause the blades or lower cutting ends thereof to be extended laterally beyond the lowerend of the supporting tube 5.

The section 19 is hollowed and provided with openings through which the locking blades 20 move, the locking blades 20 being pivotally supported in the hollow portion f of the sleeve 19. The blades 20 are also pivotally connected to the section 19 by means of the pin 22. rlhese locking blades 20are provided with elongated openings 21 arranged at angles so that the pin 22 which is connected to the section 23 and which extends transversely thereof and which connects the furcations of the lower end ofthe section 23, will cause the blades 2O to move `faces 18' move over the surfacesl of the y blades expanding the blades or moving them to positions as shown by Figure `2.

l/Vhenit is desired to remove the drilling device, the flexible member 27 is pulled `which moves the sections of the drilling device upwardly, and with the sections, moves the `pins l2 and 15 which ride over the inclined walls of the elongated openings in which they are positioned, to retract the blades and permit the drill to be removed.

`I claim i v l. In a device of the character described, anoutertube, an inner drilling member including a lower tubular section having cut out portions adjacent toits lower en d and defining ingers, a pinl connecting the lower ends of the fingers, a slidable member hav- `ing fingers movable in thextubular section, a

pinI connecting the last mentioned ingers,

blades having obliquely disposed elongated openings for thereception of the first mentioned pin and having elongated openings torthe reception oi the last mentioned pin, a movable member having cam surfaces adapted to engage the blades to force the ybiades outwardly, and means for automatically locking the inner drillingl member against rotation with respect to the outer tube.

2. In a drill, an outer tube, an inner drilling member operating in the tube and including a tubular member having fingers,

blades `pivotally supported between the fingers, a member having fingers and operating inthe tubular membei-,means for connecting the last mentioned fingers and blades, said fingers* adapted to support the blades for pivotal rmovement, and means operating in the tubular member for engaging the blades to move the blades outwardly.

3, In a drill, `an outer tube, a tubular member having fingers, blades having elongated openings disposed at oblique angles Vwith respect to the side edges of the blades Vand mounted in the outer tube, a member having tingers and operating in the second mentioned tubular member, bolts connecting the fingers and operating in the openingsto pivotally connect the fingers and blades, and means operating inthe tubular member and cont-acting with the blades for moving the blades to theiractive positions.

4t. In a drill of the class described, an outer tubular member, an inner drilling member operating `in the outer tubular memberand embodying sections movable with respect to cach other, blades pivotally sup ported by,` the movable sections and connected intermediate their ends and having lupper inclined ends, and means engaging the upper inclined ends to move the blades to their active positions. y 1 y In testimony thatI `claim the foregoing as my own, I have hereto affixed my signature.

inviNr. HARRIS. 

